Objectives
The simulator ticks each one as soon as the network meets it.
On R1, R2 and R3: multicast-routing → address-family ipv4 → interface all enable.
Under router pim → address-family ipv4 configure rp-address 2.2.2.2.
Commit the configuration on each router.
Join 239.1.1.1 on PC3, then ping 239.1.1.1 from SRC: PC3 replies.
On R3, show mrib route shows the (*,239.1.1.1) and (10.1.1.10,239.1.1.1) entries.
Before you start
Nothing is active until commit. XR runs PIM sparse mode only; there is no dense mode. IGMP needs no separate command: it runs on every multicast-enabled interface, IGMPv3 by default.
Concept
PIM sparse mode (ASM): shared tree, register, SPT
Sparse mode sends a stream only where it is requested. Receivers’ routers join a shared tree rooted at a rendezvous point (RP); the source’s router registers the stream to the RP; once the stream arrives, the receiver’s router joins the source directly on the shortest-path tree (SPT).
